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In how many different ways, can four students, Jim, Paul, Justin, and Bill, be seated in four chairs for a group discussion? => 22 or 24 or 16 or 20..

Physical Characteristics of Group 17 Elements - The important physical properties of group 17 elements are given in table. These are discussed bel..

Physical Characteristics of Group 13 Elements - The important physical constants of group 13 elements arc given in table and their physical characteristics are discussed bel..

The important physical properties of the elements of group 16 are recorded as shown below: Some physical properties of the elements of group 16 Property Oxygen Sulphur Selenium Tellurium Polonium Atomic radius (A o ) 0.73 1.09 1.16 1.35 - Ionic (M 2+ ) radius (A o ) 1.40 1.85 1...

The important physical constants of group 13 elements arc given in table and their physical characteristics are discussed below: B Al Ga In Tl Atomic radius (pm) 85 143 135 167 170 Ionic radius (pm) M 3+ 27 53.5 62.0 80.0 88.5 Density (gcm -..

Trends in Chemical Reactivity of Group 13 Elements - Unlike boron, the other members of the group are metallic and the electropositive character increases as we go down the group. All these elements in their compounds exhibit the oxidation state of + 3 and +1. The impo..

The animal kingdom is classified into distinct groups based on the body organisation discussed above. The following scheme provides an outline classification of the animal kingdom into the ten major phyl..

Animal Classification - The animal kingdom is classified into distinct groups based on the body organisation discussed above. The following scheme provides an outline classification of the animal kingdom into the ten major phyla: fig. 10.3 -Phylogenetic Tree of Animal Kingd..

Introduction - Sodium belongs to Group I in the periodic table. This group is otherwise known as the alkali metals group. Since the atomic number of sodium is 11, its electronic configuration is 2,8,1. Sodium easily loses the lone electron to attain the stable configur..

The Kingdom Metazoa includes all multicellular animals. The unicellular animals have been placed in the phylum protozoa which is now a part of the kingdom protista . Thus, all the remaining animals from sponges to mammals are now placed in the Kingdom Metazoa. Of the nearly million identified speci..